#!/usr/bin/env bash

while true; do
  echo
  echo "MENU"
  echo "1) Info about current user and OS version"
  echo "2) List files"
  echo "3) Create file"
  echo "4) Ping "
  echo "0) Exit"
  echo "================"
  read -r -p "Make your choice, Mr.Freeman: " choice

  case "$choice" in
    1)
      echo
      echo "User: $(id -un)"
      echo "UID : $(id -u)"
      echo "Groups: $(id -Gn)"
      echo "OS version:"
      if [[ -f /etc/os-release ]]; then
        . /etc/os-release
        echo "${PRETTY_NAME:-unknown}"
      else
        uname -sr
      fi
      ;;

    2)
      echo
      echo "Directory: $HOME"
      echo "Files:"
      ls -la "$HOME"
      ;;

    3)
      echo
      read -r -p "Enter directory path: " dir
      read -r -p "Enter file name: " fname
      read -r -p "Enter permissions (like 777 or smth): " perms

      if [[ ! -d "$dir" ]]; then
        echo "Error: directory does not exist"
      else
        path="$dir/$fname"
        touch "$path" 2>/dev/null || { echo "Error: cannot create file"; continue; }

        chmod "$perms" "$path" 2>/dev/null || { echo "Error: chmod failed"; continue; }

        echo "Created"
      fi
      ;;

    4)
      echo
      read -r -p "Enter host: " host
      ping -c 3 "$host"
      ;;

    0)
      exit 0
      ;;

    *)
      echo "Wrong option"
      ;;
  esac
done